annotate mercurial/streamclone.py @ 3466:7d0b4aa72322 default tip

convert a want into a list of objects for that want (trees & blobs)
author Josef "Jeff" Sipek <jeffpc@josefsipek.net>
date Sat, 21 Oct 2006 19:37:15 -0400
parents d1cbfe9e13cd
children
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1 # streamclone.py - streaming clone server support for mercurial
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2 #
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3 # Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com>
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4 #
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5 # This software may be used and distributed according to the terms
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6 # of the GNU General Public License, incorporated herein by reference.
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7
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8 from demandload import demandload
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9 from i18n import gettext as _
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10 demandload(globals(), "os stat util")
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11
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12 # if server supports streaming clone, it advertises "stream"
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13 # capability with value that is version+flags of repo it is serving.
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14 # client only streams if it can read that repo format.
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15
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16 def walkrepo(root):
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17 '''iterate over metadata files in repository.
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18 walk in natural (sorted) order.
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19 yields 2-tuples: name of .d or .i file, size of file.'''
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20
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21 strip_count = len(root) + len(os.sep)
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22 def walk(path, recurse):
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23 ents = os.listdir(path)
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24 ents.sort()
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25 for e in ents:
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26 pe = os.path.join(path, e)
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27 st = os.lstat(pe)
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28 if stat.S_ISDIR(st.st_mode):
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29 if recurse:
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30 for x in walk(pe, True):
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31 yield x
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32 else:
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33 if not stat.S_ISREG(st.st_mode) or len(e) < 2:
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34 continue
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35 sfx = e[-2:]
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36 if sfx in ('.d', '.i'):
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37 yield pe[strip_count:], st.st_size
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38 # write file data first
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39 for x in walk(os.path.join(root, 'data'), True):
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40 yield x
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41 # write manifest before changelog
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42 meta = list(walk(root, False))
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43 meta.sort()
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44 meta.reverse()
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45 for x in meta:
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46 yield x
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47
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48 # stream file format is simple.
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49 #
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50 # server writes out line that says how many files, how many total
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51 # bytes. separator is ascii space, byte counts are strings.
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52 #
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53 # then for each file:
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54 #
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55 # server writes out line that says file name, how many bytes in
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56 # file. separator is ascii nul, byte count is string.
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57 #
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58 # server writes out raw file data.
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59
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60 def stream_out(repo, fileobj):
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61 '''stream out all metadata files in repository.
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62 writes to file-like object, must support write() and optional flush().'''
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63
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64 if not repo.ui.configbool('server', 'uncompressed'):
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65 fileobj.write('1\n')
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66 return
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67
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68 fileobj.write('0\n')
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69
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70 # get consistent snapshot of repo. lock during scan so lock not
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71 # needed while we stream, and commits can happen.
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72 lock = repo.lock()
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73 repo.ui.debug('scanning\n')
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74 entries = []
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75 total_bytes = 0
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76 for name, size in walkrepo(repo.path):
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77 entries.append((name, size))
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78 total_bytes += size
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79 lock.release()
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80
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81 repo.ui.debug('%d files, %d bytes to transfer\n' %
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82 (len(entries), total_bytes))
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83 fileobj.write('%d %d\n' % (len(entries), total_bytes))
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84 for name, size in entries:
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85 repo.ui.debug('sending %s (%d bytes)\n' % (name, size))
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86 fileobj.write('%s\0%d\n' % (name, size))
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87 for chunk in util.filechunkiter(repo.opener(name), limit=size):
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88 fileobj.write(chunk)
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89 flush = getattr(fileobj, 'flush', None)
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90 if flush: flush()